19-02-2023, 04:56 PM
(This post was last modified: 19-02-2023, 05:10 PM by Malcolm Parker.)
I seem to remember that Steve's 'STOP' lamp was made by Halfords. I have an advert for it in a pre-war motoring magazine, I will scan and post it in due course.
Regarding the Time of Trip clock, I don't think it would be much use on a nav rally, all you have to do is start a stop-watch at the start of each section. when I was doing VSCC nav rallies back in the days when my eyesight was good enough to read a map in a moving car, I made a set of average speed rings to fix to the clock in the dashboard of my 1931 saloon. I read about them in S C H Davis's excellent book 'Rallies and Trials'.
You need a ring for each average speed, I made six from 16 mph to 26 mph, the range usually used in VSCC rallies.
At the start of a section set at say 22 mph, you put the ring on the clock with the start arrow on the minute hand. As time elapses, the minute hand indicates how many miles you should have covered. In the photos below, the distance covered would be about 10 miles.
I tried it on a couple of Meashams but found that driving in the dark in February, with a navigator who was prone to nodding off, it was a distraction too many! As for a 26 mph average, in an Austin 7 that was going some on the Measham.
I need to reply to my own post!
I have just realised that the speedo on my photos above clearly show that the car was doing 65 mph when I took the photos.
You can conclude that:
1. I was behind time on that section and trying to make up time.
2. The speedo always reads 65 mph.
3. The speedo needle has been permamently strained by excessive speed.
4. The speedo is very accurate as long as you know how many mph to add onto the reading.
The answer is 4. You need to add 19 mph onto the speedo reading except when the car is at rest. It is of course absurd to imagine an Austin 7 saloon doing 84 mph.
When I was doing rallies in the car the speedo was easier to read!
Regarding the Time of Trip clock, I don't think it would be much use on a nav rally, all you have to do is start a stop-watch at the start of each section. when I was doing VSCC nav rallies back in the days when my eyesight was good enough to read a map in a moving car, I made a set of average speed rings to fix to the clock in the dashboard of my 1931 saloon. I read about them in S C H Davis's excellent book 'Rallies and Trials'.
You need a ring for each average speed, I made six from 16 mph to 26 mph, the range usually used in VSCC rallies.
At the start of a section set at say 22 mph, you put the ring on the clock with the start arrow on the minute hand. As time elapses, the minute hand indicates how many miles you should have covered. In the photos below, the distance covered would be about 10 miles.
I tried it on a couple of Meashams but found that driving in the dark in February, with a navigator who was prone to nodding off, it was a distraction too many! As for a 26 mph average, in an Austin 7 that was going some on the Measham.
I need to reply to my own post!
I have just realised that the speedo on my photos above clearly show that the car was doing 65 mph when I took the photos.
You can conclude that:
1. I was behind time on that section and trying to make up time.
2. The speedo always reads 65 mph.
3. The speedo needle has been permamently strained by excessive speed.
4. The speedo is very accurate as long as you know how many mph to add onto the reading.
The answer is 4. You need to add 19 mph onto the speedo reading except when the car is at rest. It is of course absurd to imagine an Austin 7 saloon doing 84 mph.
When I was doing rallies in the car the speedo was easier to read!